A transformer bushing

Abstract

The present invention discloses a transformer bushing, comprising a head assembly, a central conduit, a composite outer sleeve, and a tail assembly. The central conduit is sequentially threaded through the head assembly, the composite outer sleeve, and the tail assembly. The central conduit comprises a current-carrying rod and a winding tube. The current-carrying rod comprises a first guide rod and a second guide rod, the first guide rod and the second guide rod being fixedly connected. The winding tube is sleeved outside the current-carrying rod, and a gap between the winding tube and the current-carrying rod is not less than 3 mm. The length of the winding tube is less than that of the current-carrying rod. The transformer bushing of the present invention has a simple structure, can ensure reliable winding of the capacitor core and reliable current carrying of the conductive rod, while ensuring stable connection and reliable matching between the various components. It also enables interchangeability of transformer bushing products of the same voltage level, thus having universality.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission and transformation insulation equipment, in particular to a transformer bushing. Background Art

[0002] Power transformers are one of the most important and expensive key power equipment in the power system, and transformer bushings are one of the key components of transformers. Currently, transformer bushings use transformer lead wires to carry current. However, for high-current transformer bushings, due to the large diameter of the lead wires, the inner diameter of the conductive rod of the transformer bushing increases accordingly. At the same time, the diameter of the aluminum tube used to roll the capacitor core also needs to increase, making it inconvenient to produce and use.

[0003] In addition, for large current transformer bushings, a guide rod structure is generally adopted, and the capacitor core is directly wound on the current-carrying guide rod. When winding the entire roll of capacitor core, a winding shaft needs to be inserted in the middle of the winding tube. The inner diameter of the current-carrying guide rod is generally small and cannot match the winding shaft. The thinner winding shaft is also prone to cause the winding shaft to rotate during the winding process. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a transformer bushing that can ensure that the capacitor core is reliably rolled and the conductive rod carries current reliably, while ensuring that the connection and fit between the various components are stable and reliable, and that transformer bushing products of the same voltage level can be interchangeable.

[0005] In order to achieve the above-mentioned purpose of the invention, the technical means adopted by the present invention are as follows: a transformer bushing, comprising a head assembly, a central conduit, a composite outer sleeve and a tail assembly, the central conduit is sequentially passed through the head assembly, the composite outer sleeve and the tail assembly, the central conduit comprises a current-carrying rod and a winding tube, the current-carrying rod comprises a first guide rod and a second guide rod, the first guide rod and the second guide rod are fixedly connected, the winding tube is sleeved outside the current-carrying rod, the gap between the winding tube and the current-carrying rod is not less than 3mm, and the length of the winding tube is less than the length of the current-carrying rod. The transformer bushing of the present application is provided with a current-carrying rod and a winding tube, current is carried separately by the current-carrying rod, and the capacitor core is wound by the winding tube, which can ensure that the winding of the capacitor core is reliable and easy to manufacture.

[0006] Preferably, the first guide rod is a solid metal round rod, comprising a body and a first connecting portion. The outer diameter of the body is larger than the outer diameter of the first connecting portion. The body is used to connect to other equipment, and the first connecting portion is used to connect to the second guide rod.

[0007] Preferably, the second guide rod is a hollow metal tube, and a first connecting groove is provided on the inner wall of one end of the second guide rod away from the tail assembly. After the first connecting part cooperates with the first connecting member groove, the first guide rod and the second guide rod are fixedly connected through a threaded connection. The threaded connection makes the connection between the first guide rod and the second guide rod more reliable and easy to install.

[0008] Preferably, the head assembly includes an oil conservator and a clamping device, the clamping device is located in the oil conservator, and the end of the winding tube away from the tail assembly is located in the oil conservator and fixed by the clamping device, so that the winding tube can be fixed in the head assembly.

[0009] Preferably, the clamping device includes a clamping nut, an upper pressure plate, a pressure plate spring, and a lower pressure plate. The lower pressure plate abuts the lower end of the interior of the oil conservator. The winding tube is sequentially passed through the clamping nut, the upper pressure plate, the pressure plate spring, and the lower pressure plate and then secured by fasteners. During installation, by tightening the clamping nut, the upper pressure plate is pressed downward, and the upper pressure plate transmits force to the oil conservator by compressing the pressure plate spring. Since the oil conservator and the lower pressure plate are fixed in position, the pressure plate spring can reversely apply force to the upper pressure plate and the clamping nut, ultimately providing an upward force to the winding tube, thereby securing the winding tube.

[0010] Preferably, the oil conservator comprises an oil conservator cover and a cabinet body, the oil conservator cover seals the cabinet body, and one end of the winding tube is sealed with the oil conservator cover to ensure the sealing of the oil conservator.

[0011] Preferably, the oil conservator cover plate has a boss extending outward along the axis of the oil conservator, and the current-carrying rod is fixed outside the oil conservator through a fixing device after extending out of one end of the winding tube. The fixing device includes a half ring, a pressure cylinder and a pressure cover. The half ring is sleeved on the outside of the current-carrying rod and abuts the boss. The pressure cylinder is covered with a half ring and abuts the oil conservator cover plate. The pressure cover seals the pressure cylinder to fix the current-carrying rod.

[0012] Preferably, the transformer bushing also includes an oil-insulating tube, one end of which is connected to the end of the composite jacket, and the tail assembly includes a glue-mounted end cover and an installation end cover, the glue-mounted end cover is connected to the other end of the oil-insulating tube, the upper end of the installation end cover matches the shape of the lower end of the glue-mounted end cover and is sealed, and the installation end cover is provided with an installation through hole, and the end of the winding tube close to the tail assembly is matched with the installation through hole and fixedly connected by threads to ensure that the part of the winding tube in the tail assembly can also be fixed.

[0013] Preferably, the tail assembly also includes a wiring terminal, and a second connecting groove is provided on the inner wall of one end of the second guide rod close to the tail assembly. The wiring terminal is matched with the second connecting groove and fixedly connected by threads. The threaded connection makes the connection between the wiring terminal and the second guide rod more reliable and easy to install.

[0014] Preferably, a tightening nut is further provided at the end portion of the second guide rod connected to the wiring terminal, and the tightening nut is sleeved on the outside of the wiring terminal for adjusting the angle of the wiring terminal.

[0015] The beneficial effects of the present application are as follows: Different from the prior art, the transformer bushing includes a current-carrying rod and a winding tube, the winding tube is arranged outside the current-carrying rod, and a gap is left between the winding tube and the current-carrying rod. The current-carrying rod is used to carry current, and the winding tube is used to roll the capacitor core. The diameter of the winding tube can be set to be larger to facilitate the rolling of the capacitor core, and the winding tube and the current-carrying rod are respectively fixedly connected to the head component and the tail component of the transformer bushing to ensure that the connection between the winding tube and the current-carrying rod is reliable, thereby ensuring the reliability of the transformer bushing. At the same time, transformer bushing products with the same voltage level and different current levels have the same external dimensions and inconsistent current-carrying rod dimensions. Therefore, winding tubes, oil storage cabinets, and composite jackets of the same size can be designed. It is only necessary to set current-carrying rods of different sizes according to different currents to achieve the interchangeability of products of different current levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic cross-sectional view of a transformer bushing 10 according to an embodiment of the present invention;

[0017] Figure 2 yes Figure 1 A magnified schematic diagram of part A;

[0018] Figure 3 is a schematic cross-sectional view of a guide ring 101 according to an embodiment of the present invention;

[0019] Figure 4 yes Figure 1 An enlarged schematic diagram of part B;

[0020] Figure 5 is a schematic cross-sectional view of a first guide rod 123 according to one embodiment of the present invention;

[0021] Figure 6 is a cross-sectional schematic diagram of a second guide rod 124 according to one embodiment of the present invention;

[0022] Figure 7 yes Figure 1 A magnified schematic diagram of part C;

[0023] Figure 8 is a schematic cross-sectional view of a Hough ring 1131 according to one embodiment of the present invention;

[0024] Figure 9 is a schematic cross-sectional view of a pressing cylinder 1132 according to one embodiment of the present invention;

[0025] Figure 10 yes Figure 4 An enlarged schematic diagram of part D in the middle;

[0026] Figure 11 yes Figure 1 A magnified schematic diagram of part E;

[0027] Figure 12 is a cross-sectional schematic diagram of an installation end cap 142 according to one embodiment of the present invention;

[0028] Figure 13 FIG. 1 is a schematic plan view of the connection terminal 143 according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] Upon request, specific embodiments of the present invention will be disclosed herein. However, it should be understood that the embodiments disclosed herein are merely exemplary of the present invention, which may be embodied in various forms. Therefore, the specific details disclosed herein are not to be construed as limiting, but merely as a basis for the claims and as a representative basis for teaching those skilled in the art to variously apply the present invention in any appropriate manner, including employing the various features disclosed herein in combination with features that may not be explicitly disclosed herein.

[0030] Unless otherwise expressly specified or limited, the term "connection" as used herein should be understood in a broad sense, and may refer to direct connection or connection through an intermediate medium. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by terms such as "upper," "lower," "end," and "one end" are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0031] like Figure 1 As shown, the transformer bushing 10 includes a head assembly 110, a central conduit 120, a composite outer jacket 130, and a tail assembly 140. The central conduit 120 is sequentially passed through the head assembly 110, the composite outer jacket 130, and the tail assembly 140. The central conduit 120 includes a winding tube 121 and a current-carrying rod 122. The winding tube 121 is sleeved outside the current-carrying rod 122, and the length of the winding tube 121 is shorter than the length of the current-carrying rod 122. The transformer bushing 10 of this embodiment is provided with the winding tube 121 and the current-carrying rod 122, respectively. Current is carried solely by the current-carrying rod 122, and a plurality of insulating layers and a plurality of capacitor screens are sequentially wound around the winding tube 121 to form a capacitor core 150. This ensures that the capacitor core 150 is reliably wound and easily manufactured.

[0032] In one application scenario, combined with Figure 1 、 Figure 2 and Figure 3A first groove 1221 is provided on the outer wall of the current-carrying rod 122 for clamping the guide ring 101. The guide ring 101 is composed of two semicircular clamps 1011. The inner ring surfaces of the two semicircular clamps 1011 are clamped on the first groove 1221, and the outer ring surface abuts the inner wall of the winding tube 121, so that the winding tube 121 and the current-carrying rod 122 are not in direct contact, and the relative position of the winding tube 121 and the current-carrying rod 122 is guaranteed to be stable. At the same time, a gap between the inner wall of the winding tube 121 and the outer wall of the current-carrying rod 122 is set to be not less than 3 mm, and one end of the current-carrying rod 122 away from the tail component 140 extends out of one end of the winding tube 121 and is connected to the cable terminal 114, and the other end of the current-carrying rod 122 close to the tail component 140 is flush with the other end of the winding tube 121.

[0033] In one application scenario, a guide ring 101 is set outside the current-carrying rod 122. In other application scenarios, a guide ring 101 can also be set at each end of the current-carrying rod 122, or multiple guide rings 101 can be set, as long as the positions of the winding tube 121 and the current-carrying rod 122 can be ensured to be relatively stable.

[0034] It should be noted that, in this embodiment, the two semicircular clamps 1011 are made of polytetrafluoroethylene, but can also be made of other insulating materials.

[0035] In one application scenario, combined with Figure 1 、 Figure 4 and Figure 5 As shown, the current-carrying rod 122 includes a first guide rod 123 and a second guide rod 124. The end of the first guide rod 123 close to the tail assembly 140 is fixedly connected to the second guide rod 124, and the end of the first guide rod 123 away from the tail assembly 140 extends out of the end of the winding tube 121. Specifically, the first guide rod 123 is a solid metal round rod, including a body 1231 and a first connecting portion 1232. The body 1231 and the first connecting portion 1232 are integrally formed. The outer diameter of the body 1231 is larger than the outer diameter of the first connecting portion 1232. The first connecting portion 1232 is provided with an external thread for connecting to the second guide rod 124.

[0036] It should be noted that in this embodiment, the body 1231 and the first connecting portion 1232 are integrally formed. In other embodiments, the body 1231 and the first connecting portion 1232 may be connected and fixed by welding or other methods. Also, in this embodiment, the body 1231 is outer-mounted with the cable terminal 114. In other embodiments, the body 1231 and the cable terminal 114 may also be integrally formed, without limitation.

[0037] Further, combined with Figure 1 、 Figures 4 to 6As shown, the second guide rod 124 is a hollow metal tube, and a first connecting groove 1241 is provided on the inner wall of one end of the second guide rod 124 away from the tail assembly 140, and an internal thread is provided on the inner wall of the first connecting groove 1241. The first connecting portion 1232 is connected to the first connecting groove 1241 through threaded cooperation, so that the first guide rod 123 and the second guide rod 124 are fixedly connected. The threaded connection makes the connection between the first guide rod 123 and the second guide rod 124 more reliable and the installation more convenient.

[0038] In one implementation scenario, after the first guide rod 123 and the second guide rod 124 are threadedly connected, the gap at the connection between the first guide rod 123 and the second guide rod 124 is further fixed by welding to ensure the sealing performance between the first guide rod 123 and the second guide rod 124, that is, to ensure the sealing of the current-carrying rod 122 in the head assembly 110 and to ensure reliable current carrying.

[0039] In another implementation scenario, the second guide rod 124 is further provided with an oil hole 1242, and the axis of the oil hole 1242 is perpendicular to the axis of the second guide rod 124. At the same time, one or more oil holes 1242 can be provided to enable the transformer oil to circulate in the transformer bushing 10 to avoid overheating of the transformer bushing 10.

[0040] like Figure 1 and Figure 7 As shown, the head assembly 110 includes an oil storage tank 111 and a clamping device 112. The clamping device 112 is located in the oil storage tank 111. The end of the winding tube 121 away from the tail assembly 140 is located in the oil storage tank 111 and is fixed by the clamping device 112, so that the winding tube 121 can be fixed in the part of the head assembly 110.

[0041] Specifically, the clamping device 112 comprises, from top to bottom (up and down in the figure), a clamping nut 1121, an upper pressure plate 1122, a pressure plate spring 1123, and a lower pressure plate 1124 within the oil conservator 111. The clamping nut 1121 is provided with a first threaded hole 1125, through which the clamping nut 1121 is connected to the winding tube 121. The threaded connection ensures a secure connection, and the winding tube 121 is secured by tightening the clamping nut 1121. Both the upper pressure plate 1122 and the lower pressure plate 1124 have first through-holes 1126 at their centers for the winding tube 121 to pass through. The upper pressure plate 1122 is further provided with a plurality of second through holes 1127, which are distributed circumferentially around the winding tube 121. The lower pressure plate 1124 is provided with a plurality of second threaded holes 1128, which are distributed circumferentially around the winding tube 121. The number of second threaded holes 1128 and the number of second through holes 1127 are the same, and their positions match. Furthermore, the pressure plate springs 1123 are sequentially positioned between the corresponding second threaded holes 1128 and second through holes 1127. After the winding tube 121 is passed through the first threaded hole 1125, the first through hole 1126 on the upper pressure plate 1122, the pressure plate spring 1123 and the first through hole 1126 on the lower pressure plate 1124 in sequence, fasteners are passed through the second threaded hole 1128 and the second through hole 1127 to fix the pressing device 112. After the tightening nut 1121 and the winding tube 121 are tightened by threads, the lower surface of the lower pressure plate 1124 abuts against the lower end of the oil storage cabinet 111, ensuring that the lower pressure plate 1124 is firmly set in the oil storage cabinet 111, and can provide an upward force to the winding tube 121 to fix the winding tube 121 and prevent it from deflecting during the operation of the transformer bushing 10; at the same time, after the lower pressure plate 1124 contacts the oil storage cabinet 111, the winding tube 121 can be electrically connected to the oil storage cabinet 111 without the need for additional connecting devices, thereby preventing suspended discharge.

[0042] Further, combined with Figure 1 and Figure 4As shown, the oil conservator 111 includes an oil conservator cover 1111 and a cabinet body 1112. The oil conservator cover 1111 covers the cabinet body 1112. A third through-hole 1113 is centrally located in the oil conservator cover 1111 for receiving a central conduit 120. The central conduit 120 is sealedly connected to the oil conservator cover 1111. The oil conservator cover 1111 also includes a first boss 1114 extending outward from the outer periphery of the third through-hole 1113. Specifically, the first boss 1114 is cylindrical in shape. The portion of the central conduit 120 that is sealedly connected to the oil conservator cover 1111 is a winding tube 121. Specifically, the end of the winding tube 121 that is distal to the tail assembly 140 is located within the first boss 1114. Specifically, the outer wall of the winding tube 121 distal to the tail assembly 140 contacts and seals the inner wall of the first boss 1114. In one application scenario, a first sealing groove 11141 is provided on the inner wall of the first boss 1114, and a first sealing member (not shown) is provided in the first sealing groove 11141. After the winding tube 121 is sleeved on the outside of the current-carrying rod 122, the end of the winding tube 121 away from the tail assembly 140 is sealedly connected to the inner wall of the first boss 1114 through the first sealing member, and the first sealing groove 11141 can be set to one or more, which is not limited here.

[0043] In one application scenario, the number of the first seal is one or more, the first seal is a rubber sealing ring, and the first seal is fixed in the first sealing groove 11141 by resin or silicone bonding. Of course, the first seal can also be made of other materials, or fixed in the first sealing groove 11141 by other bonding methods, which is not limited here.

[0044] In another implementation scenario, a first pin hole (not shown) is provided on the outer peripheral surface of the first boss 1114, and the axis of the first pin hole is perpendicular to the axis of the transformer bushing 10. A second pin hole 1234 is provided on the first guide rod 123, and the axis of the second pin hole 1234 is perpendicular to the axis of the transformer bushing 10. After the first pin hole and the second pin hole 1234 are aligned, a pin is inserted at the same time to fix the first guide rod 123 to the oil storage cabinet cover 1111, which can prevent the current-carrying rod 122 from deflecting during the operation of the transformer bushing 10.

[0045] Continue reading Figure 1 and Figure 4 The head assembly 110 further includes a fixing device 113. The current-carrying rod 122 extends out of the winding tube 121 away from the end of the tail assembly 140 and is fixed to the outside of the oil storage tank 111 through the fixing device 113. The portion of the current-carrying rod 122 extending out of the winding tube 121 is the first guide rod 123. In other words, the first guide rod 123 is fixed to the outside of the oil storage tank 111 through the fixing device 113. The fixing device 113 includes a half ring 1131, a pressure cylinder 1132 and a pressure cover 1133. Specifically, in combination with Figure 1 、 Figure 4 、 Figure 5 and Figure 8 As shown, the outer wall of the first guide rod 123 is provided with a second groove 1233, and the half ring 1131 is composed of two semicircular hoops 11311. The two semicircular hoops 11311 are provided with bolt holes. The two semicircular hoops 11311 are clamped on the second groove 1233 and then docked. Bolts are passed through the bolt holes for fastening, and the half ring 1131 is fixed to the outside of the first guide rod 123, and the end face of one side of the half ring 1131 close to the oil conservator 111 abuts against the upper end face of the first boss 1114, thereby fixing the first guide rod 123 relative to the oil conservator 111.

[0046] Continue to combine Figure 1 、 Figure 4 、 Figure 9 and Figure 10 As shown, to further strengthen the fixation of the first guide rod 123, a pressure cylinder 1132 is disposed outside the half ring 1131. The pressure cylinder 1132 completely covers the half ring 1131 and is fixedly connected to the oil conservator cover 1111. Specifically, the pressure cylinder 1132 includes a cylinder body 11321 and an extension portion 11322 extending circumferentially along the cylinder body 11321. A fourth through hole 11323 is also provided at the center of the pressure cylinder 1132. The inner wall of the fourth through hole 11323 is provided with a second sealing groove 11324. A second sealing member (not shown) is provided in the second sealing groove 11324. After the first guide rod 123 passes through the fourth through hole 11323, a sealed connection is achieved via the second sealing member. At the same time, to cover the half ring 1131, a fifth through hole 11325 is provided at the center of the pressure cylinder 1132, coaxially arranged with the fourth through hole 11323. The outer diameter of the fifth through hole 11325 is larger than the inner diameter of the fourth through hole 11323. The fourth through hole is located away from the lower end surface of the pressure cylinder 1132, while the fifth through hole 11325 is located closer to the lower end surface of the pressure cylinder 1132. The pressure cylinder 1132 covers the half ring 1131 within the fifth through hole 11325, so that the lower end surface of the extension portion 11322 abuts the upper end surface of the oil conservator cover 1111.

[0047] In one application scenario, the extension portion 11322 has several connecting holes (not shown) distributed in a circle around the axis of the pressure cylinder 1132, and the oil storage tank cover 1111 is provided with countersunk holes corresponding to the several connecting holes. The pressure cylinder 1132 is fixedly connected to the oil storage tank cover 1111 by fasteners passing through the connecting holes and countersunk holes.

[0048] In another application scenario, a third groove 11326 is further provided on the bottom surface of the pressing cylinder 1132, and a second boss 1115 is further provided on the oil storage tank cover 1111. When the lower end surface of the extension portion 11322 abuts against the upper end surface of the oil storage tank cover 1111, the third groove 11326 matches and covers the second boss 1115, and a third sealing groove 1116 is provided on the second boss 1115. A third sealing member (not shown) is arranged in the third sealing groove 1116 to further ensure the sealing of the oil storage tank 111 and prevent external water vapor from entering the oil storage tank 111.

[0049] Furthermore, to secure the pressure cylinder 1132, a gland 1133 is provided on the upper end surface of the pressure cylinder 1132. Gland 1133 seals the pressure cylinder 1132 via fasteners. The connection between the gland 1132 and the oil conservator cover 1111 is similar in structure and will not be further described. To enhance sealing, a fourth sealing groove 11327 is provided on the upper end surface of the pressure cylinder 1132. A fourth sealing member (not shown) is located within this groove to ensure a seal between gland 1133 and the pressure cylinder 1132.

[0050] It should be noted that the second seal, the third seal, and the fourth seal are made of the same material and bonded in the same manner as the first seal, and the second sealing groove 11324 can be provided as one or more, which will not be elaborated herein.

[0051] Furthermore, if Figure 1 、 Figure 11 and Figure 12 As shown, the transformer bushing 10 also includes an oil-insulated tube 160. The end of the oil-insulated tube 160 away from the tail assembly 140 is connected to the end of the composite jacket 130 close to the tail assembly 140. The tail assembly 140 includes a glue-mounted end cap 141 and a mounting end cap 142. The glue-mounted end cap 141 is fixedly mounted on the end of the oil-insulated tube 160 close to the tail assembly 140, and the glue-mounted end cap 141 is sealed to the outer peripheral surface and end surface of the other end of the oil-insulated tube 160 close to the tail assembly 140. Specifically, a fifth sealing groove 1411 is provided on the end surface of the glue-mounted end cap 141 that contacts the oil-insulated tube 160. While the glue-mounted end cap 141 and the outer peripheral surface of the oil-insulated tube 160 are fixed by glue, a fifth sealing member (not shown) is provided in the fifth sealing groove 1411 to seal and fix the glue-mounted end cap 141 to the oil-insulated tube 160.

[0052] At the same time, the upper end of the mounting end cover 142 matches the shape of the lower end of the glue-binding end cover 141 and is sealed and connected. Specifically, a sixth sealing groove 1421 is provided on the end surface where the mounting end cover 142 contacts the glue-binding end cover 141. When the mounting end cover 142 seals the glue-binding end cover 141, a sixth sealing member (not shown) is provided in the sixth sealing groove 1421 to seal and fix the mounting end cover 142 and the glue-binding end cover 141.

[0053] Continue reading Figure 12 A mounting through-hole 1422 is provided at the center of the mounting end cover 142, and the mounting through-hole 1422 is passed through the end of the winding tube 121 close to the tail assembly 140, and is fixedly connected to the mounting end cover 142. Specifically, an internal thread is provided on the inner wall of the mounting through-hole 1422 close to the glue-bonded end cover 141, and an external thread is provided on the outer periphery of the end of the winding tube 121 close to the tail assembly 140. The winding tube 121 is threadedly connected to the mounting through-hole 1422, and a seventh sealing groove 1423 is provided on the inner wall of the mounting through-hole 1422 away from the glue-bonded end cover 141. A seventh sealing member (not shown) is provided in the seventh sealing groove 1423 to ensure that the winding tube 121 and the mounting end cover 142 are sealed and fixed, that is, to ensure that the part of the winding tube 121 close to the tail assembly 140 can also be sealed and fixed, thereby preventing external moisture from entering the transformer bushing 10 from the tail of the transformer bushing 10.

[0054] It should be noted that the fifth sealing member, the sixth sealing member, and the seventh sealing member are made of the same material and bonded in the same manner as the first sealing member, and the seventh sealing groove 1423 can be provided as one or more, which will not be described in detail.

[0055] Continue reading Figure 1 and Figure 11 , the tail assembly 140 also includes a terminal 143, combined with Figure 6 As shown, a second connecting groove 1243 is provided on the inner wall of one end of the second guide rod 124 near the tail assembly 140, and the terminal 143 is connected to the second connecting groove 1243, thereby fixing the terminal 143 and the second guide rod 124. Furthermore, a tightening nut 144 is provided at the end of the second guide rod 124 where it is connected to the terminal 143. The tightening nut 144 is sleeved onto the outside of the terminal 143 and abuts against the end of the second guide rod 124 near the tail assembly 140, thereby locking the second guide rod 124 and the terminal 143. Furthermore, the angle of the terminal 143 can be adjusted at will.

[0056] Specifically, combined Figure 1 、 Figure 11 and Figure 13 As shown, terminal block 143 includes a second connecting portion 1431, a baffle 1432, and a mounting plate 1433. Second connecting portion 1431 is cylindrical, and both baffle 1432 and mounting plate 1433 are thin plates. One end of second connecting portion 1431 is connected to one side of baffle 1432, and one end of mounting plate 1433 is connected to the other side of baffle 1432. Mounting plate 1433 is provided with a wiring hole (not shown) for connecting transformer winding leads. In one embodiment, second connecting portion 1431, baffle 1432, and mounting plate 1433 are integrally formed, but they can also be connected and fixed to each other through other means such as welding.

[0057] Furthermore, the outer circumference of the second connecting portion 1431 is provided with external threads, and the inner wall of the second connecting groove 1243 is provided with internal threads. Thus, the terminal 143 is threadedly connected to the second guide rod 124. This threaded connection makes the connection between the terminal 143 and the second guide rod 124 more reliable and easier to install. When installing the terminal 143, first install the tightening nut 144 onto the terminal 143. That is, rotate the tightening nut 144 to the end of the second connecting portion 1431 near the baffle 1432. Then, rotate the tightening nut 144 and the terminal 143 together into the second connecting groove 1243. The installation angle of the terminal 143 is adjusted, and the tightening nut 144 is tightened so that the tightening nut 144 is in contact with the end of the second guide rod 124, thereby ensuring the threaded locking between the terminal 143 and the second guide rod 124. When the installation angle of the terminal 143 needs to be adjusted, simply loosen the tightening nut 144 to make the adjustment.

[0058] In one implementation, a fourth groove is further defined at the end where the second connection portion 1431 connects to the baffle 1432, creating a gap 1435 between the second connection portion 1431 and the baffle 1432. Furthermore, an oil passage 1436 is defined on the outer circumference of the terminal block 143. The oil passage 1436 extends axially along the second connection portion 1431. A single oil passage 1436 may be provided, or multiple oil passages 1436 may be evenly distributed. Because the transformer bushing 10 under test is positioned vertically (as shown in the figure), transformer oil can flow out of the gap 1435 along the oil passage 1436. This allows any remaining transformer oil within the current-carrying rod 122 of the transformer bushing 10 to be drained during testing, facilitating secondary packaging and transportation.

[0059] In another implementation scenario, a third pin hole 1424 is further provided on the outer peripheral surface of the mounting end cover 142, and the axis of the third pin hole 1424 is perpendicular to the axis of the transformer bushing 10. A fourth pin hole (not shown) is further provided on the side of the winding tube 121 corresponding to the third pin hole 1424. After the third pin hole 1424 is aligned with the fourth pin hole, a pin is inserted at the same time to fix the winding tube 121 to the mounting end cover 142, thereby preventing the winding tube 121 from deflecting during the operation of the transformer bushing 10.

[0060] The transformer bushing 10 provided in this embodiment includes a current-carrying rod 122 and a winding tube 121. The winding tube 121 is sleeved outside the current-carrying rod 122, with a gap left between the winding tube 121 and the current-carrying rod 122. The current-carrying rod 122 is used to carry current, and the winding tube 121 is used to roll the capacitor core 150. In this way, the diameter of the winding tube 121 can be set to be larger. On the one hand, it is convenient to roll the capacitor core 150. On the other hand, transformer bushings 10 with the same voltage level and different current levels have the same external dimensions but different current-carrying rod 122 dimensions. Therefore, the winding tube 121, oil conservator 111, and composite jacket 130 can be designed with the same dimensions. Only by setting the current-carrying rod 122 of different sizes according to different currents can products of different current levels be interchangeable. At the same time, the winding tube 121 and the current-carrying rod 122 are sealed and fixedly connected to the head component 110 and the tail component 140 of the transformer bushing 10 respectively, ensuring a reliable connection between the winding tube 121 and the current-carrying rod 122, thereby ensuring the overall reliability of the transformer bushing 10.

[0061] The technical content and technical features of the present invention have been disclosed above. However, it is understood that, based on the creative ideas of the present invention, those skilled in the art may make various changes and improvements to the above-mentioned structures and materials, including combinations of the technical features disclosed or claimed herein, and obviously including other combinations of these features. Such variations and / or combinations fall within the technical field involved in the present invention and fall within the scope of protection of the claims of the present invention.

Claims

1. A transformer bushing, comprising a head assembly, a central conduit, a composite outer sleeve, and a tail assembly, wherein the central conduit is sequentially passed through the head assembly, the composite outer sleeve, and the tail assembly, characterized in that: The central catheter comprises: A current-carrying rod, comprising a first guide rod and a second guide rod, wherein the first guide rod and the second guide rod are fixedly connected; A winding tube, wherein the winding tube is sleeved outside the current-carrying rod, the gap between the winding tube and the current-carrying rod is not less than 3 mm, and the length of the winding tube is less than the length of the current-carrying rod; The head assembly includes an oil conservator, which includes an oil conservator cover plate, and the oil conservator cover plate has a boss extending outwardly along the axis of the oil conservator. The current-carrying rod extends out of the one end of the winding tube and is fixed to the outside of the oil conservator by a fixing device. The fixing device includes a half ring, a pressure cylinder and a pressure cover. The half ring is sleeved on the outside of the current-carrying rod and abuts the boss. The pressure cylinder is covered with the half ring and abuts the oil conservator cover plate. The pressure cover covers the pressure cylinder to fix the current-carrying rod. The outer wall of the winding tube at one end away from the tail assembly is in contact with the inner wall of the boss and is sealed. The transformer bushing also includes an oil-insulating tube, one end of which is connected to the end of the composite jacket. The tail assembly includes a glue-mounted end cover and an installation end cover. The glue-mounted end cover is connected to the other end of the oil-insulating tube, and the upper end of the installation end cover matches the shape of the lower end of the glue-mounted end cover and is sealed. The installation end cover is provided with an installation through hole, and one end of the winding tube close to the tail assembly is matched with the installation through hole and fixedly connected by threads.

2. The transformer bushing according to claim 1, characterized in that: The first guide rod is a solid metal round rod. The first guide rod includes a body and a first connecting portion. The outer diameter of the body is greater than the outer diameter of the first connecting portion.

3. The transformer bushing according to claim 2, characterized in that: The second guide rod is a hollow metal tube. A first connecting groove is provided on the inner wall of one end of the second guide rod away from the tail assembly. After the first connecting portion cooperates with the first connecting groove, the first guide rod and the second guide rod are fixedly connected through a threaded connection.

4. The transformer bushing according to claim 1, wherein: The head assembly further comprises a pressing device, which is located in the oil conservator. One end of the winding tube away from the tail assembly is located in the oil conservator and is fixed by the pressing device.

5. The transformer bushing according to claim 4, characterized in that: The clamping device includes a clamping nut, an upper pressure plate, a pressure plate spring and a lower pressure plate. The lower pressure plate abuts the lower end of the oil storage cabinet. The winding tube passes through the clamping nut, the upper pressure plate, the pressure plate spring and the lower pressure plate in sequence and is fixed by fasteners.

6. The transformer bushing according to claim 4, wherein: The oil conservator further comprises a cabinet body, the oil conservator cover plate covers the cabinet body, and the one end of the winding tube is sealedly connected to the oil conservator cover plate.

7. The transformer bushing according to claim 3, wherein: The tail assembly further includes a connecting terminal. A second connecting groove is provided on the inner wall of one end of the second guide rod close to the tail assembly. The connecting terminal is fixedly connected to the second connecting groove through threads after being matched with the second connecting groove.

8. The transformer bushing according to claim 7, wherein: The end portion of the second guide rod connected to the wiring terminal is further provided with a tightening nut, and the tightening nut is sleeved on the outside of the wiring terminal.

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